in terms of quantum numbers yes! but since QCD is strongly coupled we run into huge problems when we think of mesons being a bound state of quarks and gluons!
confinement 
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But for weak interactions such linear combinations (also for the charged pions, e.g. π^- = u'd) are still good, right? (Since they produce correct decay rates, cross ratios, for the pions.) What do you think?
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well the thing is the thing is that QCD becomes strongly coupled at distances ~ 10 femtometer ~ 1/Λ_QCD s.. so we've never actually seen such a state at those energies .. indeed a bound state makes perfect sense there, but that's just not what we call a π^0 w. mass ~135MeV
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Shit! This is what I used to work on. Stop fucking me with nostalgia.
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